According to Wikipedia,
Growth hacking is a process of rapid experimentation across marketing channels and product development to identify the most effective, efficient ways to grow a business. Growth hackers are marketers, engineers and product managers that specifically focus on building and engaging the user base of a business.
Growth hacking is so misunderstood that there is a desperate need for this chapter. Few concepts have been as polarizing and revolutionary, simultaneously. Is it marketing in disguise? Is it a buzz phrase used to increase salaries? Is it the future of internet products? In this 46-minute video, Neil Patel explains Growth hacking with some great examples: